Using method of safety protection of high-voltage and direct current contactors for electric automobile

A technology for electric vehicles and safety protection, which is applied in the direction of electric vehicles, battery/battery traction, electrical devices, etc., and can solve problems such as damage to contactor contacts and affecting the service life of contactors

CN106696710AActive Publication Date: 2017-05-24天津易鼎丰动力科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-24

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Abstract

The invention discloses a using method of safety protection of a high-voltage and direct current contactors for an electric automobile. The using method comprises the steps that at the time of precharging a motor controller, specifically, a main negative contractor is closed when high voltage power-on of an electric automobile direct current high voltage system is conducted, then a precharging loop is closed to finish precharging of the motor controller, and finally a main positive contractor in the electric automobile direct current high voltage system is closed; and partition current flow direction outage is adopted at the time of the outage of the electric automobile direct current high voltage system. The specific process comprises the steps that if the current flow direction in the system is consistent with the current flow direction when precharging is conducted on the motor controller, the main positive contractor is switched off firstly and then the main negative contractor is switched off; and if the current flow direction in the system is opposite to the current flow direction when precharging is conducted on the motor controller, the main negative contractor is switched off firstly and then the main positive contractor is switched off. In the process of charging and discharging of the high voltage system, the effect of protecting the contact points of the high voltage contractors is achieved by controlling different closing orders of the main positive and negative contractors.
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Description

technical field

[0001] The invention relates to a direct-current high-voltage system of an electric vehicle, and in particular to a method for using a safety protection DC high-voltage contactor of an electric vehicle. Background technique

[0002] In recent years, electric vehicles have become more and more common as a new means of transportation. The popularity of electric vehicles has continued to increase, and the technologies involved in the development and manufacture of electric vehicles have also continued to improve. The high-voltage main contactor of electric vehicles is an important part of the high-voltage circuit of electric vehicles. The high-voltage system of the battery pack of electric vehicles can only output high-voltage power to external electrical appliances by closing the high-voltage main contactor. The number of closing times of the high-voltage main contactor is limited, especially when the high-voltage circuit has a current flowing through it, it wi...

Examples

Embodiment Construction

[0011] Below in conjunction with accompanying drawing, the present invention will be further described:

[0012] According to the accompanying drawings, the existing electric vehicle battery pack outputs high-voltage DC power, and forms a loop through the total positive contactor S1, the total negative contactor S2 and the motor controller. The positive pole of the battery pack is connected to the positive contact of the total positive contactor S1, and then The negative contact of the total positive contactor S1 is connected to the positive terminal of the motor controller, the negative pole of the battery pack is connected to the positive contact of the total negative contactor S2, and then the negative contact of the total negative contactor S2 is connected to the negative terminal of the motor controller, pre-charging circuit Set in parallel with the main positive contactor S1; the motor controller is in a state of power consumption when the vehicle is driving, and the curr...